Fix agent reading and editing files over SSH (#30144)

Release Notes:

- Fixed a bug that would prevent the agent from working over SSH.

---------

Co-authored-by: Nathan Sobo <nathan@zed.dev>
Co-authored-by: Richard Feldman <oss@rtfeldman.com>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Cole Miller <m@cole-miller.net>

crates/agent/src/active_thread.rs

@@ -3252,15 +3252,18 @@ impl ActiveThread {
             .map(|tool_use| tool_use.status.clone())
         {
             self.thread.update(cx, |thread, cx| {
-                thread.run_tool(
-                    c.tool_use_id.clone(),
-                    c.ui_text.clone(),
-                    c.input.clone(),
-                    &c.messages,
-                    c.tool.clone(),
-                    Some(window.window_handle()),
-                    cx,
-                );
+                if let Some(configured) = thread.get_or_init_configured_model(cx) {
+                    thread.run_tool(
+                        c.tool_use_id.clone(),
+                        c.ui_text.clone(),
+                        c.input.clone(),
+                        &c.messages,
+                        c.tool.clone(),
+                        configured.model,
+                        Some(window.window_handle()),
+                        cx,
+                    );
+                }
             });
         }
     }